1 Laboratory of Biostatistics and Medical Informatics and IBILI, Faculty of Medicine, University of Coimbra, Azinhaga Santa Comba, Celas, 3000-548 Coimbra, Portugal. Electronic address: miguelpatricio@gmail.com.
2 Laboratory of Biostatistics and Medical Informatics and IBILI, Faculty of Medicine, University of Coimbra, Azinhaga Santa Comba, Celas, 3000-548 Coimbra, Portugal.